And now, to a seismic change coming to your supermarket. And a nation of Americans squinting at those food labels. Today, the fda announced that those labels need to change, and the calories in big bold type. A kind of wake-up call about what we really eat. Here's ABC's David Kerley. Reporter: Soon as you cruise the grocery aisle, the fine print on those 700,000 labels will tell you what you already know. You often consume more than one serving at a time. So, this is 2 1/2 times. You are going to drink the whole thing? Yeah, of course. Reporter: Soda and other drinks are a perfect example. Today, eight ounces is considered a serving. But that's just 30% to 40% of an average bottle. And we usually drink the whole bottle. So, instead of 100 calories, we are really getting 250. It's one serving to you? Right. Reporter: Under this plan announced today, nutrition fact labels will now reflect how we really eat and drink, showing us how many calories we are consuming in big, bold Numbers on the new-look label. This is a great example. Ice cream, your treat at the end of the day. But admit it, you scoop out more than the standard serving. Today, a half cup is a serving size. But we usually put a full cup in our bowl. So, that will be the new serving size. 130 versus 260 calories. A half bagel is considered a single serving today. But we eat a whole one. The new serving size, double the calories. Same for a muffin. You don't eat just half. So, the whole thing will be the serving size. That's really more than 400 calories. Along with the larger calorie count Numbers, foodmakers will also have to list the sugars they've added. A more realistic look at what we're really putting in our bodies. David Kerley, ABC news, Washington.

This transcript has been automatically generated and may not be 100% accurate.

Now Playing: Rare Look Inside War-Torn Aleppo as Refugees Return After Years Away

Now Playing: {{itm.title}}

{"id":22709728,"title":"Changes Coming to Nutrition Labels","duration":"3:00","description":"FDA announces calories will be in big bold type making it easier to read.","url":"/WNT/video/coming-nutrition-labels-22709728","section":"WNT","mediaType":"default"}